Checks / troubleshooting:
1. Check connection of PG origin sensor,
PG motor connector and CR FFC.
2. Is screw of coupling installed on PG
motor loose?
3. Is coupling skewed?
4. Is screw on Worm drive loose?
5. Is direction of worm wheel appropriate?
6. PG origin sensor may be damaged.
7. CR board may be damage.
8. CR_FFC may be damaged.
9. PG motor may be damaged.
10. MAIN board may be damaged.

Recommended actions:
Make sure to connect it surely.